Carboy

By admin · Friday, September 29th, 2006

Carboy

When homebrewing an English Stout, can I use a glass carboy for the initial fermentation?

I've looked to various resources and seen different answers. Some instructions say the glass carboy is for the secondary fermentation (racking), however, with a stout, I don't think I'm going to do a secondary fermentation. I have an autosiphon, so transferring isn't an issue. I'm worried about the pressure from the active ferment, and the possibility of a glass shrapnel bomb in my basement if my co2 valve gets blocked. Any ideas/experiences to share? Thanks.

Generally people start homebrewing with the bare necessities because the equipment costs can add up when getting started. So, the starting equipment is usually a bucket and a carboy. Plastic buckets are slightly oxygen permeable, so while they work fine for primary fermentation when CO2 production is high and there is a slight positive pressure within the bucket, they can allow some oxidising when used for secondary fermentation and have the possibility of hurting the final flavors...this is why glass is recommended over plastic for secondary. However, using glass for primary is a step up so you're always going to win using glass for both primary and secondary. Your carboy will not explode if your airlock gets plugged up. It will be ejected from the neck of the carboy before the carboy will break. It's still possible, and for that reason, a lot of people who do primary in carboys will use a blowoff tube instead of an airlock. When the bubbles and the foam gets too vigorous, it will just blow off into a bucket of water instead of clogging up and possibly blowing off your airlock.
Besides, I like blowoff tubes because the bubbling amuses me.

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